TEPZZ 8_8995A_T EP A1 (19) (11) EP A1 (12) EUROPEAN PATENT APPLICATION. (51) Int Cl.: G06F 3/0488 ( )

Transcription

1 (19) TEPZZ 8_899A_T (11) EP A1 (12) EUROPEAN PATENT APPLICATION (43) Date of publication: Bulletin /01 (1) Int Cl.: G06F 3/0488 (13.01) (21) Application number: (22) Date of filing: (84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME (72) Inventor: Krokstäde, Calle Hong Kong (CN) (74) Representative: Ström & Gulliksson AB P.O. Box Malmö (SE) (71) Applicant: Doro AB Lund (SE) (4) Improved tactile feedback for touch display (7) A keypad (0) comprising: a base layer (16) comprising at least one hole (37a); an interior layer (14) comprising at least one collapsible dome (3a); an intermediate layer (12) comprising at least one hole (32a); and an exterior layer comprising at least one dome (a-c), wherein the at least one hole (37a) of the base layer (16), the at least one collapsible dome (3a) of the interior layer (14), the at least one hole (32a) of the intermediate layer (12) and the at least one dome (a-c) of the exterior layer () are correspondingly aligned to form at least one key (3) for cooperating with a touch display. EP A1 Printed by Jouve, 7001 PARIS (FR)

2 1 EP A1 2 Description TECHNICAL FIELD [0001] This application relates to a keypad, a mobile communications terminal and a method for an improved user interface, and in particular to a keypad, a mobile communications terminal and a method for an improved user interface for providing a tactile feel of a touch display. BACKGROUND [0002] Touch display based user interfaces are becoming more and more common on the mobile communications terminal market offering many applications and functions not available on traditional keypad-based interfaces. [0003] They are also commonly easier to use with their look and point style interaction with a user and for these two reasons, and other, they are becoming more and more attractive also to users who are not always technically adept and prone to adopt new technology. [0004] Such users have demonstrated a difficulty in understanding the concept of key input on a touch display as they do not receive any tactile feedback that a key has been pressed. The users are thus uncertain how hard to press and this uncertainty is one obstacle in adopting the new technology. [000] Another problem with touch-based interfaces is that a user s finger is no longer given any physical guidance and inputting text on a touch display requires more focus from the user to be able to correctly find the wanted key. In key-based user interfaces one or more keys were physically marked to enable a user to find his way using only feel. [0006] To overcome these problems, some solutions for attaching a keypad over a touch display have been proposed. However, these solutions all suffer from a complicated design and the resulting complicated structure increases the cost of the product and the constructions are also prone to breaking. [0007] One solution is proposed in the US patent application US32821 which discloses systems for an optically clear keyboard that can be applied to a touchsensitive display screen, for example, while mitigating distortion of the display. An apparatus for use over a touch-sensitive display screen can comprise a plurality of button structures formed of an optically clear material. The buttons are disposed in an optically clear fluid or gel having an index of refraction equivalent to the index of refraction of the button structures. The apparatus comprises an optically clear elastomeric membrane over the fluid, which forms a sealed barrier for the fluid or gel. The volume within the sealed portion of the apparatus contains the fluid and the button structures. [0008] Such prior art systems that are arranged with gels or liquids and are thus highly dependent on maintaining an intact structure or the keys will become unusable and the touch device carrying the keys will become smeared with the liquid or gel, possibly damaging the touch device. [0009] One solution is provided by the US patent application US624 which discloses a method includes applying a lip, comprised of a first material, along at least a portion of an actuator of an electronic device, and applying a coating, comprised of an elastic material, to cover a part of the actuator, the coating disposed to facilitate actuation of the actuator. [00] Another solution is provided by the international patent application WO A1 which discloses an input element for operating a touch-screen, said input element comprising an electrically conductive layer which is applied to an electrically nonconductive substrate. The electrically conductive layer is structured and has at least one button, conductor track and/or electrode, wherein at least one electrode and/or conductor track is operatively connected to the touch-screen. [0011] And a third solution is provided by the US patent application US which discloses an input device that includes a thin film substrate on which a fixed electrode is formed, and a movable electrode formed of a conductive material, the fixed electrode including a capacitance detection electrode and a connection section, the movable electrode including a displacement section that is disposed to be opposite to the capacitance detection electrode and deformed by a pressing force, and a stationary section that is connected to the connection section, the input device detecting a change in capacitance that occurs when the displacement section has been pressed. [0012] Such prior art solutions suffer from complicated designs. [0013] There is thus a need for a manner of providing a tactile feel of a touch based user interface to a user which is easy to use and which is minimally confusing to a user and which is of simple construction. SUMMARY [0014] It is an object of the teachings of this application to overcome the problems listed above by providing an accessory device for touch devices, such as a keypad comprising a base layer comprising at least one hole, an interior layer comprising at least one collapsible dome, an intermediate layer comprising at least one hole, and an exterior layer comprising at least one dome, wherein the at least one hole of the base layer, the at least one collapsible dome of the interior layer, the at least one hole of the intermediate layer and the at least one dome of the exterior layer are correspondingly aligned to form at least one key for cooperating with a touch display. [00] In one embodiment the keypad is optically clear or transparent, which enables it to be used with a touch display without obstructing any content being displayed on an underlying touch display. [0016] It is also an object of the teachings of this ap- 2

3 3 EP A1 4 plication to overcome the problems listed above by providing a mobile communications terminal comprising a touch display and a keypad according to above mounted on said touch display. [0017] It is also an object of the teachings of this application to overcome the problems listed above by providing a mobile communications terminal comprising a touch display wherein said touch display is arranged with a recess for receiving a keypad according to above to be mounted on said touch display. This enables the keypad to be mounted in line or aligned with the rest of the touch display surface. [0018] It is also an object of the teachings of this application to overcome the problems listed above by providing a method for providing a keypad comprising forming a base layer comprising at least one hole, forming an interior layer comprising at least one collapsible dome, forming an intermediate layer comprising at least one hole and forming an exterior layer comprising at least one dome, pressing together the base layer, the interior layer, the intermediate plate and the exterior layer and correspondingly aligning the at least one hole of the base layer, the at least one collapsible dome of the interior layer, the at least one hole of the intermediate layer and the at least one dome of the exterior layer to form at least one key for cooperating with a touch display. [0019] In one embodiment the method further comprises mounting the keypad on a touch display aligning the keys with positions for content to be displayed. [00] Such accessory devices exemplified through a keypad as disclosed herein may be produced cheaply as it basically is basically formed of only two layers (possibly plastic), one being arranged with an adhesive surface for attaching to a touch display, and one arranged with collapsible domes. The accessory device herein is further configured with a protective exterior layer and an intermediate plate layer for added support. The accessory device may be removably attached to any touch display thereby enabling it to be used on any touch device, especially mobile communications terminals; also as it may be attached post sale by the user himself. Should the user mount the accessory device incorrectly, it can easily be re aligned or replaced. [0021] The key domes may be designed to enlarge the underlying key which further improves the usability for technically inapt users such as the elderly also commonly suffering from reduced eye sight. The distortion of the underlying displayed content is thus designed to be put into good use through a clever and insightful design. [0022] The inventors of the present invention have realized, after inventive and insightful reasoning, that by utilizing a keypad as disclosed herein, a simple, cost efficient manner of producing and mounting a keypad to provide tactile feedback is achieved. This provides for a very simple solution as an alternative to the solutions proposed by contemporary technologies, i.e. the prior art - and the solution is also superior to the prior art in that it is cheaper and more easy to assemble/mount [0023] Also, by realizing that such keys can be adopted in mobile communication terminals, tactile feedback can be provided to a user in a cost efficient manner, both construction-wise and assembly-wise and the keypad can easily be mounted, remounted and replaced in a manner that is unavailable in the prior art systems. [0024] Other features and advantages of the disclosed embodiments will appear from the following detailed disclosure as well as from the drawings. BRIEF DESCRIPTION OF DRAWINGS [002] The invention will be described in further detail under reference to the accompanying drawings in which: Figure 1 shows a schematic view of a general mobile communications terminal arranged to be used with an accessory device, such as a keypad, according to one embodiment of the teachings of this application; Figure 2 shows a schematic view of the components of a mobile communications terminal as in figure 1; Figure 3 shows a view of an accessory device, in this example a keypad, according to one embodiment of the teachings of this application; Figure 4 shows a view of a touch device being arranged with an accessory device such as a keypad, according to one embodiment of the teachings of this application; Figure shows an exploded perspective view of a keypad according to one embodiment of the teachings herein; Figure 6 shows an exploded sectional view of a keypad according to one embodiment of the teachings herein; Figure 7 shows a sectional view of a keypad being arranged in a recess of a touch display according to one embodiment of the teachings herein; Figure 8 shows an alternative keypad according to one embodiment of the teachings therein; and Figure 9 shows a flowchart of a method according to one embodiment of the teachings herein. DETAILED DESCRIPTION [0026] The disclosed embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which certain embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of example so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout. [0027] Figure 1 shows an example of a touch device 0. In the example of figure 1 the touch device is a mo- 3

4 EP A1 6 bile communications terminal 0. The touch device may also be a laptop computer or desktop computer having a touch display, a tablet computer, a game device, a media device, a navigation device or other touch device capable of presenting virtual keys and receiving touch input on said virtual keys. An example of a mobile communications terminal 0 will be described with simultaneous reference to figure 2 which shows a schematic overview of the components of a touch device, such as a mobile communications terminal 0. [0028] The mobile communications terminal 0 comprises a housing 1 housing a touch display 1. The touch display 1 forms part of a user interface 2 and is arranged to display one or more virtual keys or icons 1a-c. The touch display is also arranged for receiving touch input, possibly indicating and activating one of the displayed virtual keys 1a-c. In one embodiment the touch display is arranged to display at least three virtual keys 1a-c being associated with a menu function presenting menu options, a home function for returning to a home screen and return or back function for returning to the previous screen or the next higher level in a user interface hierarchy respectively. Such keys are commonly known in the technical field of mobile communications terminals. One example being the three virtual keys utilized in the Android operating system. Such virtual keys 1a-c may be arranged to always be displayed (at least when the mobile communications terminal is operational) irrespective of the application currently being executed. [0029] The user interface 2 may further comprise one or more hard keys 13 (only one shown in figure 1). The mobile communications terminal 0 also comprises a controller 2, such as one or more central processing units or other processors, which reads instructions stored in a memory 2. The memory may be implemented using any known memory technology, such as Random Access memory, Read-Only Memory, Flash drives or such as is known to a skilled person. The memory may also store one or more applications. The applications and the instructions stored in the memory 2 control the operation of the mobile communications terminal 0 when executed by the controller 2. A touch device 0 may also comprise a radio frequency (RF) interface 2 for communication with other devices. The RF interface may be a cellular interface. The RF interface 2 may also be a short range interface such as according to the standards IEEE , Bluetooth or ZigBee to mention a few. A combination of a short range and a cellular interface may also be possible and is commonly the case for a mobile communications terminal 0. [00] Figure 3 shows an accessory device according 0 to one embodiment of the teachings presented herein. In this embodiment the accessory device is a keypad 0 having three keys 3a-c. In other embodiments the accessory device may be a protective layer or screen providing a magnifying function and a tactile feel for a larger area of a touch display. In one embodiment the keypad 0 is formed of optically clear material(s) making the keypad 0 to be substantially transparent. This enables the keypad 0 to be attached to a touch device, such as the mobile communications terminal 0 of figure 1, without obstructing or blocking any underlying content being displayed on the touch display 1 on which the keypad 0 is attached. [0031] In one embodiment the keypad 0 is made from a non-transparent material. In such an embodiment the keypad 0 may be arranged with descriptive text on any or all of the keys 3a-c indicating the function of the key to a user. This enables the keypad to better convey the function of a key by, for example, using an enlarged key label. It also allows for a simple reconfiguration of the function of the key and conveying this to a user. Also, the labels may be arranged on a keypad 0 being (substantially) transparent for emphasising the function of the corresponding key(s) 3a-c. [0032] It should be noted that even if the keypad 0 is shown as having three keys 3a-c,a keypad 3 may be formed having any number of keys 3, for example 1, 2, 3, 9, 12 or any number. Also any alignment and arrangement of the keys 3 is possible and within the scope of the teaching of this application. In fact, the simple structure of the keypad 0 facilitates such flexibility in designing the keypad 0 and is one of the benefits in utilizing such keypads. [0033] Figure 4 shows a touch device 0, in this example a mobile communications terminal 0, being arranged with an accessory device, in this example a keypad 0. The keypad 0 is designed so that the keys 3a-c substantially overlap the touch keys 1a-c. The keypad 0 can therefore be attached to the touch display 1 so that each key 3a-c is positioned over each virtual key 1a-c respectively. A combined user interface is thus formed for the mobile communications terminal 0 effectively transforming the virtual keys 1ac to hard keys 3a-c. In an embodiment where the keys 3a-c are transparent, the resulting keys would be able to function as a softkey, i.e. a key whose functions changes and the current function is displayed on a display. [0034] By attaching the keypad 0 on the touch display 1 in an area overlapping virtual keys that are often or always presented (at least when in operation) it is possible to effectively form a keypad 3 emulating the performance of a hard-wired keypad on the touch display 1 and guide a user s fingers to the correct key. As the keypad 0 may be transparent the display function of the touch display 1 is not affected and the touch display 1 may continue to display content even in the portions underlying the keypad 0. [003] In an embodiment where the keys 3a-c of the keypad 0 are formed as domes, the shape of the dome may be designed so as to enlarge any underlying content. The use of such a keypad 0 thus also brings about the added benefit of enlarging the underlying displayed content so that a user suffering from reduced eyesight, which is common among elderly users, may be able to perceive the function of the virtual key 1a-c more easily. This 4

5 7 EP A1 8 may also be utilized in other instances where the underlaying displayed content could beneficially be displayed in a larger size. [0036] The general structure of a keypad 0 will now be described with simultaneous reference to figures and 6. Figure shows an exploded perspective view of a keypad 0 according to one embodiment of the teachings herein. Figure 6 shows an exploded sectional view of a keypad 0 according to one embodiment of the teachings herein. [0037] As can be seen in figures and 6, the keypad 0 basically consists of two films. One upper film and one lower film 16 (seen from the user s perspective). The lower film 16 is arranged to constitute the base of the keypad 0 and to be attached to a touch display 1 and will hereafter be referred to as the base layer 16. The base layer 16 may be arranged with an adhesive layer 6 for attaching the base layer 16 and thus the keypad 0 to the touch display 1. Alternatively, the base layer 16 may be attached to the touch display 1 in other manners as well, possibly through applying an adhesive substance or in addition to the adhesive layer 6. In one embodiment, where the base layer 16 is formed by a double coated tape, the adhesive layer 6 is included in the double coated tape as one of the coatings. [0038] The upper film is actually comprised of three layers, an exterior layer, an intermediate plate layer 12 and an interior layer 14. [0039] The exterior layer is formed as a transparent PET film. The exterior layer may also be hardened to protect against wear and tear. In one embodiment the exterior layer is formed of ultraviolet cured acrylate coating on a polyester film. [00] The interior layer 14 is also formed as a transparent PET layer such as polyester terephthalate. [0041] The intermediate plate layer 12 may be formed as a double coated film. [0042] The exterior layer and the interior layer 14 are each formed to comprise at least one dome a-c and 3a respectively. It should be noted that for clarity purposes only one dome 3a of the interior layer 14 is referenced in the figures, but it should be noted that the other unreferenced domes correspond to the domes 3b-c in the exterior layer. The same applies to the holes 32a and 37a of the base layer 16 and the intermediate plate layer 12. The domes a-c of the exterior layer and the domes 3a of the interior layer 14 together form the keys 3 of the keypad 0. The keys 3 are designed to be collapsible. In one embodiment the dome 3a of the interior layer 14 is designed to be collapsible and the domes a-c of the exterior layer are designed to be flexible so as to follow the movement of the finger as it pushes on the exterior layer and thereby also allowing the pushing movement to translate to the corresponding dome 3a of the interior layer 14 which dome then collapses and pushes on the underlying virtual key 1 of the touch display 1. The intermediate plate layer 12 is arranged between the exterior layer and the interior layer 14 to provide support and also to allow for movement of the respective domes a-c and 3a.The intermediate plate layer 12 is arranged with holes 32a positioned to correspond to each a dome a-c, 3a of the exterior layer and the interior layer 14. This provides a distance element between the interior layer 14 and the exterior layer which distance element facilitates individual movement of the corresponding domes a-c and 3a. [0043] In one embodiment the keypad film resulting from the base layer 16, the interior layer 14, the intermediate plate layer 12 and the exterior layer is 0.4 mm thick and the domes protrude to an additional height of 0.7 mm making the whole keypad 0 being 1. mm thick. [0044] The base layer 16 and the intermediate plate layer 12 may be made of Double Coated tape. One example of such a double coated tape is the 3M High Strength Double Coated Tape with Adhesive 0LSE, 9LE having a thickness well suited for being used in a keypad such as herein.. When applying the tape, a jig may be used in order to get as much pressure as possible during assembly of the keypad 0. [004] As a key is subjected to physical force such as when being pressed on by a user s finger, the corresponding dome 3a of the interior layer 14 is deformed into a collapsed state enabling the key to interact with the underlying touch display 1. [0046] In one embodiment the dome 3a of the interior layer is constructed to collapse when being exposed to a pressure of approximately 1 g. The pressure needed may also be any pressure in the range g. This enables a user to perceive a tactile feel of a button being pressed without having to push too hard, which could be uncomfortable to a user. The tensile strength required is specified by the material and the thickness of the interior layer. In one embodiment the interior layer 14 is 0. mm thick. The thickness of the layer depends on the wanted collapsing pressure and on the material of the interior layer and may therefore vary depending on those factors. [0047] In the collapsed state the user s finger makes indirect contact with the underlying touch display 1 for transferring of achieved pressure for touch displays working with pressure control. For touch displays working by detecting a capacitance, the PET films in the layers and the resulting keypad 0 are thin enough to allow the user s finger to be detected at the touch point through the keypad 0. [0048] The very simple design of the keypad 0 makes it easy to manufacture and assemble. The keypad 0 is also thin enough to convey any touch. This provides a keypad 0 that is highly versatile, easy to manufacture and simple to assemble which enables provision of a tactile feel to a touch device without obscuring the content being displayed on a touch display 1. [0049] As can be seen in figure, the shaping of the

6 9 EP A keypad 0 is highly flexible and the keypad 0 may be formed with different cut outs. Such cut outs may be used for aligning the keypad 0 during assembly or for enabling a wide contact surface without blocking some components such as a microphone. [000] It should be noted that the touch display 1 (and the touch device 0 comprising the touch display) may not be a part of the keypad 0 and they may be provided as separate devices. By providing the keypad 0 as a separate device, as opposed to or in addition to providing the keypad as integrated with the touch display 1, it is easy to replace the keypad should it become worn. It is also possible to allow a user to customize his device selecting the keypads 0 he desires, with regards to aesthetic appearance or key layout representing a functionality. A keypad 0 may also be used to replace the functionality of a function or better emphasize it. For example, if a user solely or mostly uses his mobile communications terminal for a particular purpose, a keypad designed for that purpose (key shapes or key labels) may be used to emphasize or facilitate such use. [001] As the key domes 3a have a tensile strength and will only collapse when a specific pressure has been applied, the user will get the feeling of actually pressing on something and as the dome collapses the user will get a tactile feel of when the pressure of the touch has been adequate for providing a successful touch action. [002] Technically inapt users will thus understand more easily how the touch input works and how hard and long to push. [003] Furthermore, since the domes are convex by their nature, they may be shaped to enlarge any underlying displayed content. This enables the keypad to work as a magnifier improving the understanding of the underlying displayed content with persons suffering from reduced eyesight. By realizing that the convex shape of a dome can be used to do good for persons suffering from reduced eyesight a further benefit of using a keypad 0 as herein is achieved. Some examples of other instances when it may be useful to enlarge the underlying content is for navigation devices that are to be used in moving vehicles and communication devices for professional drivers. [004] Figure 7 shows an alternative arrangement of a keypad 0 on a touch display 1 of a touch device 0, such as a mobile communications terminal 0. A portion of the surface of the touch display 1 has been chamfered to provide a recess 7 arranged to receive the keypad 0. The recess 7 may also be formed in other ways, for example through molded glass or plastic displays being molded to incorporate the recess. A recess 7 may also be formed effectively by arranging a screen protector on the touch display, which screen protector does not cover the whole display 1. If the screen protector has the same thickness as the keypad s basic layer, the keypad 0 may be arranged in the area not covered by the screen protector. [00] By chamfering away a portion to provide a recess for receiving the keypad, an inventive manner of integrating the keypad 0 in a touch display 1 is achieved. Using precision tools and care when attaching the keypad 0, the keypad 0 may even be attached seamlessly and thus forming an integral part of the touch display. The attachment may be made during manufacture or assembly of the mobile communications terminal 0 or by a user post sale. A keypad 0 attached in a recess is additionally protected against wear and tear, especially the edges of the keypad 0 are protected and the keypad 0 will thus run a smaller risk of being (partially) torn off. Should the keypad 0 be torn off or come loose, it can easily be replaced with a new keypad 0 by simply aligning the replacement and attaching it. [006] Figure 8 shows an alternative keypad 0 having a different key arrangement 3. In this configuration the keypad 0 has 12 keys 3 for being used on a (virtual) ITU-T keypad. Other variations are also possible, for example different variations for being used with QW- ERTY or AZERTY keyboards - or variations thereof. [007] Figure 9 shows a flowchart of a method according to one embodiment of the teachings herein where a base layer is formed 9 by a plate such as a double coated tape for providing support to an interior layer, formed 9 of a PET film having collapsible domes that are aligned with holes in the base layer. A further intermediate plate layer is formed 9 also having holes corresponding to the holes in the base layer and for providing support and an exterior layer is formed 9 of a PET film also having domes corresponding to the domes of the interior layer and the base layer and the intermediate film. The four films or layers are pressed together 90 so that they may bond through an adhesive coating on the base layer and on the intermediate plate layer thereby providing a transparent keypad to be used with a touch device. The keypad is then mounted on a touch display, aligning the domes with content to be displayed on the touch display. It should be noted that in some embodiments the content to be displayed may also be displayed - additionally or alternatively, on the keypad. This enables for a hard key keypad to be manufactured cheaply and used on a touch device, utilizing the touch display and the touch input to provide for a highly flexible platform for which keypads may easily be manufactured for. A new device may thus efficiently be provided by a simple reprogramming of a touch device and providing a new keypad - without having to change the physical design or construction of the touch device. [008] One benefit of the teachings herein is that the keypad is cheap to manufacture and easy to assemble. Another benefit is that the keypad 0 is easily mounted on a device and may also be replaced easily. A further benefit is that the domes may be shaped to enlarge the underlying displayed content thus enabling a user to more easily see the symbols presented and understand the function associated with a virtual key. [009] Another benefit is that the keypad 0 is constructed through four films irrespective of the number of 6

7 11 EP A1 12 keys or the arrangement of the keys. No additional loose parts are needed that require careful mounting as in the prior art. This enables a much simpler assembly and mounting of the keypad. [0060] The invention has mainly been described above with reference to a few embodiments. However, as is readily appreciated by a person skilled in the art, other embodiments than the ones disclosed above are equally possible within the scope of the invention, as defined by the appended patent claims. 8. The keypad (0) according to any of claims 1-7, wherein said keypad (0) is transparent. 9. The keypad (0) according to claim 8, wherein said key (3) is shaped to magnify any underlying content.. A mobile communications terminal (0) comprising a touch display (1) and a keypad according to any of claims 1 to 9 mounted on said touch display (1). Claims 1. A keypad (0) comprising: a base layer (16) comprising at least one hole (37a); an interior layer (14) comprising at least one collapsible dome (3a); an intermediate layer (12) comprising at least one hole (32a); and an exterior layer () comprising at least one dome (a-c), wherein the at least one hole (37a) of the base layer (16), the at least one collapsible dome (3a) of the interior layer (14), the at least one hole (32a) of the intermediate layer (12) and the at least one dome (a-c) of the exterior layer () are correspondingly aligned to form at least one key (3) for cooperating with a touch display. 2. The keypad (0) according to claim 1, wherein said base layer (16) and said intermediate plate layer (12) are each comprised of a double coated tape. 3. The keypad (0) according to claim 2, wherein said double coated tape is applied with an adhesive for mounting said interior layer(12) and said exterior layer () to said base layer (16) and said intermediate layer (14). 4. The keypad (0) according to any of claims 1-3, wherein said interior layer (14) is formed by a transparent PET layer The mobile communications terminal (0) of claim, wherein said touch display (1) is arranged with a recess (7) in which the keypad (0) is mounted. 12. A mobile communications terminal (0) comprising a touch display (1) wherein said touch display (1) is arranged with a recess (7) for receiving a keypad (0) according to any of claims 1 to 9 to be mounted on said touch display (1). 13. A method for providing a keypad (0) comprising forming a base layer (16) comprising at least one hole (37a); forming an interior layer (14) comprising at least one collapsible dome (3a); forming an intermediate layer (12) comprising at least one hole (32a); forming an exterior layer comprising at least one dome (a-c); and pressing together the base layer (16), the interior layer (14), the intermediate plate (12) and the exterior layer () and correspondingly aligning the at least one hole (37a) of the base layer (16), the at least one collapsible dome (3a) of the interior layer (14), the at least one hole (32a) of the intermediate layer (12) and the at least one dome (ac) of the exterior layer () to form at least one key (3) for cooperating with a touch display. 14. The method of claim 13 further comprising mounting the keypad (0) on a touch display (1) aligning the keys (3) with positions for content to be displayed.. The keypad (0) according to claim 4, wherein said interior layer (14) is formed by a polyester terephtalate film. 6. The keypad (0) according to any of claims 1-, wherein said exterior layer () is formed by a transparent PET film The keypad (0) according to claim 6, wherein said exterior layer () is formed by a polyester film having an ultraviolet cured acrylate coating. 7

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15 EP A1 REFERENCES CITED IN THE DESCRIPTION This list of references cited by the applicant is for the reader s convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard. Patent documents cited in the description US A [0007] US 624 A [0009] WO A1 [00] US A [0011]